Please post your opinions.
Realistically they are all the same. They all have the 3.5GB VRAM issue. that's about it. just get what ever which one you could afford.
Is one louder than the other?
It's a matter of opinion really. the EVGA 970 and the ASUS 970 both have the Quiet modes, where they don't spin until the temperatures are above 60C. i'm not quite sure of the Zotac card though.
The Zotac must be better since it has a longer name. Duh.